CHAPTER 4
Quality, Risk, Opportunity, and Improvement
This chapter is one of the larger and more challenging ones but getting hold of the classic and foundational principles here is vital for a safe understanding and application of quality thinking.
Consistency and Variation
A main criterion of quality is consistent delivery to the requirements. Variation is the enemy of consistency. A consistent measurement outcome always yields the same result. A measure of consistency is the scatter or dispersion of results around some, assumed, true value. Perfect consistency can be represented by a single value on a chart, variation by a bell-shaped curve around the average or central value. If we weigh 10 screws on a balance, we expect to get the same result ...
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